If the HYD cue light and a LOW indication appear for Sys 1 Aux pump switchlight, what does this indicate?

When the HYD cue light and a LOW indication illuminate for the Sys 1 Aux pump switchlight, it signifies a failure of the auxiliary pump. This condition indicates that the auxiliary pump is unable to maintain adequate hydraulic pressure due to either a malfunction within the pump itself or a loss of hydraulic fluid performance.

Auxiliary pumps are critical for maintaining hydraulic systems, and their failure could mean a reduction in hydraulic pressure, which may lead to compromised control of flight surfaces or landing gear operations. In a flight operation, recognizing this failure promptly is crucial for the continued safe operation of the aircraft, as it may require the pilot to take corrective action or rely on alternate hydraulic systems. Understanding this indication helps pilots identify and respond to potential hydraulic problems effectively.